The "test-disasm-arm64/DISASM_debug" test would fail on hardware because we
expected a "hlt" instruction instead of "brk". The former is specific to running
inside the simulator.

Bug: 
Change-Id: I7a5a3d4c1a93d03bbf4c934037c565d27379c2b5
Reviewed-on: https://chromium-review.googlesource.com/570442Reviewed-by: Benedikt Meurer <bmeurer@chromium.org>
Commit-Queue: Pierre Langlois <pierre.langlois@arm.com>
Cr-Commit-Position: refs/heads/master@{#46663}